<div id="pl-3111"  class="panel-layout" ><div id="pg-3111-0"  class="panel-grid panel-no-style" ><div id="pgc-3111-0-0"  class="panel-grid-cell"  data-weight="1" ><div id="panel-3111-0-0-0" class="so-panel widget widget_text panel-first-child" data-index="0" data-style="{&quot;background_image_attachment&quot;:false,&quot;background_display&quot;:&quot;tile&quot;}" >			<div class="textwidget"><p>The development of LED lamps has gone through five stages:</p>
<p>One: In the 1960s, people learned the basics of semiconductor materials that can produce light, and the first commercial LED diodes were produced in 1960<a href="https://nsslighting.com/">.</a></p>
<p>Two: The core part of the light-emitting diode is a wafer composed of p-type semiconductors and n-type semiconductors. There is a transition layer between p-type semiconductors and n-type semiconductors, called p-n junction.</p>
<p>Elements In and N were introduced in the mid-1970s, enabling LED lights to produce green, yellow, and orange light, and their luminous efficiency increased to 1 lumen/watt</p>
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		</div><div id="panel-3111-0-0-1" class="so-panel widget widget_sow-image" data-index="1" data-style="{&quot;background_image_attachment&quot;:false,&quot;background_display&quot;:&quot;tile&quot;}" >[siteorigin_widget class="SiteOrigin_Widget_Image_Widget"]<input type="hidden" value="{&quot;instance&quot;:{&quot;image&quot;:2838,&quot;image_fallback&quot;:&quot;&quot;,&quot;size&quot;:&quot;full&quot;,&quot;align&quot;:&quot;default&quot;,&quot;title_align&quot;:&quot;default&quot;,&quot;title&quot;:&quot;&quot;,&quot;title_position&quot;:&quot;hidden&quot;,&quot;alt&quot;:&quot;&quot;,&quot;url&quot;:&quot;&quot;,&quot;bound&quot;:true,&quot;_sow_form_id&quot;:&quot;15676241636356265d78edc509139191&quot;,&quot;_sow_form_timestamp&quot;:&quot;1666590335199&quot;,&quot;new_window&quot;:false,&quot;full_width&quot;:false,&quot;so_sidebar_emulator_id&quot;:&quot;sow-image-311110001&quot;,&quot;option_name&quot;:&quot;widget_sow-image&quot;},&quot;args&quot;:{&quot;before_widget&quot;:&quot;&lt;div id=\&quot;panel-3111-0-0-1\&quot; class=\&quot;so-panel widget widget_sow-image\&quot; data-index=\&quot;1\&quot; data-style=\&quot;{&amp;quot;background_image_attachment&amp;quot;:false,&amp;quot;background_display&amp;quot;:&amp;quot;tile&amp;quot;}\&quot; &gt;&quot;,&quot;after_widget&quot;:&quot;&lt;\/div&gt;&quot;,&quot;before_title&quot;:&quot;&lt;h3 class=\&quot;widget-title\&quot;&gt;&quot;,&quot;after_title&quot;:&quot;&lt;\/h3&gt;&quot;,&quot;widget_id&quot;:&quot;widget-0-0-1&quot;}}" />[/siteorigin_widget]</div><div id="panel-3111-0-0-2" class="so-panel widget widget_text panel-last-child" data-index="2" data-style="{&quot;background_image_attachment&quot;:false,&quot;background_display&quot;:&quot;tile&quot;}" >			<div class="textwidget"><p>Three: In 1989, white LED lamps were successfully developed.</p>
<p>The LED is packaged with a GaN chip and aluminum garnet (YAG).</p>
<p>The GaN chip emits blue light (λp=465nm, Wd=30nm). After the YAG with Ce3+ content made by high temperature sintering is stimulated by this blue light, the phosphor emits yellow light with a peak value of 550nm.</p>
<p>Four: In 1993, Japan Nakamura Shuji successfully developed a high-brightness blue light-emitting diode.</p>
<p>Compared with traditional fluorescent lamps and incandescent bulbs, LEDs are not only small in size, environmentally friendly, power-saving, and have a lifespan of up to 100,000 hours. Light-emitting diodes have jumped to become a new light source for lighting and displays in the 21st century.</p>
<p>5: On October 13, 2018, the team of academicians Huang Wei and Wang Jianpu of the Chinese Academy of Sciences increased the external quantum efficiency of perovskite light-emitting diodes (LEDs) to 20.7%, nearly half of that of international counterparts. &#8221; published on.</p>
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